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Electric Horsepower to BTU per Second Converter

Convert hp(E) to BTU/s with our free online power converter.

Quick Answer

1 Electric Horsepower = 0.707072 BTU/s

Formula: Electric Horsepower × conversion factor = BTU per Second

Use the calculator below for instant, accurate conversions.

Our Accuracy Guarantee

All conversion formulas on UnitsConverter.io have been verified against NIST (National Institute of Standards and Technology) guidelines and international SI standards. Our calculations are accurate to 10 decimal places for standard conversions and use arbitrary precision arithmetic for astronomical units.

Last verified: February 2026Reviewed by: Sam Mathew, Software Engineer

Electric Horsepower to BTU per Second Calculator

How to Use the Electric Horsepower to BTU per Second Calculator:

  1. Enter the value you want to convert in the 'From' field (Electric Horsepower).
  2. The converted value in BTU per Second will appear automatically in the 'To' field.
  3. Use the dropdown menus to select different units within the Power category.
  4. Click the swap button (⇌) to reverse the conversion direction.
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How to Convert Electric Horsepower to BTU per Second: Step-by-Step Guide

Converting Electric Horsepower to BTU per Second involves multiplying the value by a specific conversion factor, as shown in the formula below.

Formula:

BTU/s = hp(E) × 0.707072

Example Calculation:

1 hp(E) = 0.707072 BTU/s

Disclaimer: For Reference Only

These conversion results are provided for informational purposes only. While we strive for accuracy, we make no guarantees regarding the precision of these results, especially for conversions involving extremely large or small numbers which may be subject to the inherent limitations of standard computer floating-point arithmetic.

Not for professional use. Results should be verified before use in any critical application. View our Terms of Service for more information.

Need to convert to other power units?

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📋 Unit Symbols

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What is a Electric Horsepower and a BTU per Second?

1 hp(E) = 746 W = 0.746 kW = 1.0004 hp (mechanical) = 2,545 BTU/h

Difference from mechanical hp: 746 W vs 745.7 W (0.04% higher)

1 BTU/s = 1,055.06 W = 1.055 kW = 3,600 BTU/h = 1.41 hp = 0.001055 MW

Note: The Electric Horsepower is part of the imperial/US customary system, primarily used in the US, UK, and Canada for everyday measurements. The BTU per Second belongs to the imperial/US customary system.

Common Uses and Applications: hp(E) vs BTU/s

Explore the typical applications for both Electric Horsepower (imperial/US) and BTU per Second (imperial/US) to understand their common contexts.

Common Uses for hp(E)

Electric Motors: Industrial motors, pumps, compressors (ratings in hp(E)). HVAC: Fan motors, blower motors (fractional to 10 hp). Manufacturing: Conveyor motors, machine tools (1-100 hp). Residential: Garage door openers, pool pumps (0.5-3 hp).

When to Use BTU/s

Rare Unit: Almost never used in practice. Theoretical: Engineering textbooks, conversion tables. Alternatives Preferred: MW for large systems, BTU/h for HVAC. Historical: Old power plant references (now use MW).

Additional Unit Information

About Electric Horsepower (hp(E))

How do I convert electric horsepower to watts?

Formula: W = hp(E) × 746

Examples:

  • 1 hp(E) = 746 W
  • 5 hp(E) = 3,730 W = 3.73 kW
  • 10 hp(E) = 7,460 W = 7.46 kW
  • 0.5 hp(E) = 373 W

Electric HP to Watts converter →

What is the difference between electric and mechanical horsepower?

Electric HP (hp(E)): 746 W exactly (US electric motors) Mechanical HP (hp): 745.7 W (550 ft⋅lb/s, automotive standard)

Difference: 0.04% (practically identical)

Usage:

  • Electric motors → hp(E)
  • Engines (gas, diesel) → mechanical hp
  • International → kW preferred

Conversion: 1 hp(E) = 1.0004 hp (mechanical)

How much power does a 1 hp electric motor use?

Full load: 746 W input (if 100% efficient)

Realistic power draw (accounting for efficiency):

  • 50% efficiency: 1,492 W (1.5 kW)
  • 70% efficiency: 1,066 W (1.07 kW)
  • 85% efficiency: 878 W (0.88 kW)
  • 90% efficiency: 829 W (0.83 kW)

Example: 1 hp motor at 85% efficiency draws 878W. Running 8 hours = 7 kWh energy consumed.

Modern motors: 85-95% efficient. Older motors: 70-85%.

Why use hp(E) instead of kW?

US tradition: Motor industry established before SI metric adoption

Current practice:

  • US: Both hp(E) and kW used (hp(E) more common for small motors)
  • Europe/Asia: Primarily kW
  • International standards: Moving toward kW only

Nameplate labeling: Many US motors show both (e.g., "1 hp / 0.75 kW")

Conversion: Divide hp(E) by 1.341 to get kW

How do I size a motor for my application?

Basic formula: Required hp = (Torque × RPM) ÷ 5,252

Practical approach:

  1. Determine load requirements (torque, speed, duty cycle)
  2. Add safety factor: Multiply by 1.15-1.25 (15-25% margin)
  3. Select next standard size: 1/4, 1/3, 1/2, 3/4, 1, 1.5, 2, 3, 5, 7.5, 10 hp

Example: Application needs 0.8 hp → Add 25% = 1 hp → Select 1 hp motor

Avoid oversizing: Wastes energy, motors run inefficiently at low load.

About BTU per Second (BTU/s)

How do I convert BTU/s to kW or MW?

Formula:

  • kW = BTU/s × 1.055
  • MW = BTU/s × 0.001055

Examples:

  • 100 BTU/s = 105.5 kW = 0.106 MW
  • 1,000 BTU/s = 1,055 kW = 1.055 MW
  • 10,000 BTU/s = 10,550 kW = 10.55 MW

BTU/s to kW converter → BTU/s to MW converter →

How do I convert BTU/s to BTU/h?

Formula: BTU/h = BTU/s × 3,600

Examples:

  • 1 BTU/s = 3,600 BTU/h
  • 100 BTU/s = 360,000 BTU/h
  • 1,000 BTU/s = 3,600,000 BTU/h (3.6 million BTU/h)

BTU/s to BTU/h converter →

Why not use BTU/s for power plants?

Megawatts clearer: 500 MW vs 473,900 BTU/s International standard: MW used globally Simpler calculations: Metric system easier Industry convention: All power plants rated in MW or GW

Example: Nuclear reactor

  • As MW: 1,000 MW (clear, concise)
  • As BTU/s: 947,800 BTU/s (unwieldy)
  • As BTU/h: 3.41 billion BTU/h (also unwieldy)

MW is the practical choice for large power systems.

Conversion Table: Electric Horsepower to BTU per Second

Electric Horsepower (hp(E))BTU per Second (BTU/s)
0.50.354
10.707
1.51.061
21.414
53.535
107.071
2517.677
5035.354
10070.707
250176.768
500353.536
1,000707.072

People Also Ask

How do I convert Electric Horsepower to BTU per Second?

To convert Electric Horsepower to BTU per Second, enter the value in Electric Horsepower in the calculator above. The conversion will happen automatically. Use our free online converter for instant and accurate results. You can also visit our power converter page to convert between other units in this category.

Learn more →

What is the conversion factor from Electric Horsepower to BTU per Second?

The conversion factor depends on the specific relationship between Electric Horsepower and BTU per Second. You can find the exact conversion formula and factor on this page. Our calculator handles all calculations automatically. See the conversion table above for common values.

Can I convert BTU per Second back to Electric Horsepower?

Yes! You can easily convert BTU per Second back to Electric Horsepower by using the swap button (⇌) in the calculator above, or by visiting our BTU per Second to Electric Horsepower converter page. You can also explore other power conversions on our category page.

Learn more →

What are common uses for Electric Horsepower and BTU per Second?

Electric Horsepower and BTU per Second are both standard units used in power measurements. They are commonly used in various applications including engineering, construction, cooking, and scientific research. Browse our power converter for more conversion options.

For more power conversion questions, visit our FAQ page or explore our conversion guides.

Helpful Conversion Guides

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📚 How to Convert Units

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🔢 Conversion Formulas

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All Power Conversions

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Other Power Units and Conversions

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Verified Against Authority Standards

All conversion formulas have been verified against international standards and authoritative sources to ensure maximum accuracy and reliability.

NIST Reference on Constants, Units and Uncertainty

National Institute of Standards and Technology — Fundamental physical constants and unit conversions

BIPM SI Units

Bureau International des Poids et Mesures — International System of Units (SI) definitions and standards

ISO 80000

International Organization for Standardization — Quantities and units international standards series

Last verified: February 19, 2026